Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

1D

IEC

IEC D flip-flop (rectangular form)

In IEC form the D flip-flop is an unlabelled bistable outline with a clock input labelled C1 carrying the dynamic wedge, and a data input labelled 1D to show it is controlled by C1. Asynchronous set and reset inputs are labelled S and R without a number. The two outputs are Q and its complement shown with a negation or polarity mark.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular bistable with dynamic C1 input and 1D data input. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

The IEC D latch has a C1 input without a dynamic mark and is transparent while C1 is active.

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D-FF

Symbols

Positive-edge D flip-flop

Captures its data input at the documented positive clock edge and retains that digital state.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

An edge-triggered flip-flop differs from a transparent latch; data timing relative to the clock remains essential.

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Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.